There is no server keys for Burnes .. if its a public server you need a server key .. u can turn server key ( signed ) off .. but you will be hacked very quickly .. if your going to use mods with no server key .. you have to whitelist the server aka password protect

I just deleted all the mods I had installed while steam and a3launcher were off, launched steam and went through workshop to download manually all the mods and voila, now for some reason it worked just fine. I don't understand why the hell it did not work before.